Messages in this thread Patch in this message | | | From | Alexander Sapozhnikov <> | Subject | [PATCH] mm/vmalloc: fix unsafe dereference of potential null ptr in vmalloc_init() | Date | Fri, 17 Feb 2023 15:51:05 +0300 |
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Return value of a function 'kmem_cache_create' is dereferenced at vmalloc.c:2444 without checking for null, but it is usually checked for this function.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Alexander Sapozhnikov <alsp705@gmail.com> --- mm/vmalloc.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index ca71de7c9d77..ed75dfd44b85 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2426,6 +2426,8 @@ void __init vmalloc_init(void) * Create the cache for vmap_area objects. */ vmap_area_cachep = KMEM_CACHE(vmap_area, SLAB_PANIC); + if (!vmap_area_cachep) + return; for_each_possible_cpu(i) { struct vmap_block_queue *vbq; -- 2.34.1
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